The arm64 version of dcagatay/ubuntu-dind uses the x86_64 s6-overlay

[wuanqi-199205]

Problem Description:

When I build a new Docker image from dcagatay/ubuntu-dind:20.04 on an arm64 machine, I found that both dcagatay/ubuntu-dind:20.04 and dcagatay/ubuntu-dind:22.04 use the x86_64 s6-overlay in their Dockerfiles.

This causes the container to fail to start on the arm64 machine with the error: /init: 45: exec: s6-overlay-suexec: Exec format error.

Suggestion:

In the Dockerfile, define the architecture. If the architecture is aarch64, then ADD s6-overlay-aarch64.tar.xz; if it is x86_64, then ADD s6-overlay-x86_64.tar.xz.